Unitarily-tuned transponder/shield assembly
First Claim
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1. A transponder assembly for use with a recognition and identification system suitable for mounting on metal comprising:
- a shield member formed of a non-ferrous material for mounting on a metal object;
an insulative support member mounted to said shield member; and
a transponder having an antenna connected to a tank circuit, said transponder mounted on said support member and electrically isolated from said shield member, said shield member interacting with said tank circuit and said antenna such that the combination of said tank circuit, said antenna and said shield is tuned as a single unit to an operating frequency.
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Abstract
This invention relates to a shielded transponder 12 which is capable of being mounted on any surface, whether ferromagnetic or not. The transponder includes an antenna which in use is susceptible to detuning as a result of being mounted on a ferromagnetic surface. The shield 16 prevents this detuning and enables the transponder 12 to be mounted on any surface. The shield 16 may produce slight detuning, however, this can be compensated for by pretuning of the transponder.
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Citations
9 Claims
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1. A transponder assembly for use with a recognition and identification system suitable for mounting on metal comprising:
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a shield member formed of a non-ferrous material for mounting on a metal object; an insulative support member mounted to said shield member; and a transponder having an antenna connected to a tank circuit, said transponder mounted on said support member and electrically isolated from said shield member, said shield member interacting with said tank circuit and said antenna such that the combination of said tank circuit, said antenna and said shield is tuned as a single unit to an operating frequency. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of preventing detuning of a recognition and identification system transponder when mounted on metal comprising the steps of:
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providing a shield member formed of a non-ferrous material and suitable for mounting on a metal object; attaching an insulative support member to said shield member; mounting a transponder having an antenna connected to a tank circuit on said insulative support and such that said transponder is electrically isolated from said shield member and such that the combination of said shield member, said antenna, and said tank circuit interact; and tuning said combination to said selected operating frequency. - View Dependent Claims (8, 9)
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Specification